how can i generate random string with requirements in python?

Question

I'm trying to generate random unique code with requirements :

At least one number
At least one string
It should 8 characters
No repeating strings and numbers in one line

here's my code

import random

chars = 'CDHKPQRVXY'
nums =  '123456789'
total = 10
rndstr = [1,2,3,4,5,6,7]
rndint = [1,2,3,4,5,6,7]
random.choice(rndstr)
random.choice(rndint)

for i in range(total):
    selects = random.sample(chars, random.choice(rndstr)) + random.sample(nums, random.choice(rndint))
    random.shuffle(selects)
    unique_code = ''.join(selects)
    print(unique_code)

Expected Output :

1DXVQP7H
V3H6QP2K
R3562197
CDVQXHK9

The problem with the code above is that it doesn't meet the third point

Generate a random number x between 1 and 8; that's the amount of numbers you'll draw from nums. Then 8-x is the amount of random strings you draw from chars. For both you make a copy of both lists, and remove that item once you've drawn it. That way you'll have 8 characters, at least one string, at least one number, and no repeating characters/numbers. — sander
– sander, Commented May 6, 2021 at 8:30

Guy · Accepted Answer · 2021-05-06 08:32:32Z

3

Keep random.choice(rndstr) as a variable and decrease it from 8 when selecting random number

for i in range(total):
    str_len = random.choice(rndstr)
    selects = random.sample(chars, str_len) + random.sample(nums, 8 - str_len)
    random.shuffle(selects)
    unique_code = ''.join(selects)
    print(unique_code)

answered May 6, 2021 at 8:32

Guy

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2 Comments

here Over a year ago

thank's Guy, it's work, but how if requirements changes at least 2 numbers and at least 2 strings in a one line?

Guy Over a year ago

@here you can remove 1 and 7 from the rndstr list, you can use slice of it random.choice(rndstr[1:6]) and you can replace rndstr with range random.choice(range(2, 7)).

user2390182 · Accepted Answer · 2021-05-06 08:38:31Z

0

You can use randint to chose the number of digits, no need for list to choose from:

from string import ascii_uppercase as upp, digits as dig
from random import sample, shuffle, randint

for i in range(5):
    shuffle(s := sample(dig, n := randint(1, 7)) + sample(upp, 8-n))
    print("".join(s))

CYBOLN1K
3751NLIQ
05816R34
4012OC3E
GHWZB5SC

answered May 6, 2021 at 8:38

user2390182

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1 Comment

here Over a year ago

Okay thank you @schwobaseggl it works simple and fast, but i don't use all component in digits, but okay

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